Manufacture of acicular ferrimagnetic iron oxide

Details Manufacture of acicular ferrimagnetic iron oxide Manufacture of acicular ferrimagnetic iron oxide

1980-07-31

1983-01-04

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, 423632, C01G 4906

Patent

active

043672140

ABSTRACT:
A process for the manufacture of acicular ferrimagnetic iron oxide by heating iron(III) oxide or iron(III) oxide hydroxide at 220.degree.-460.degree. C. under a water vapor partial pressure of not less than 30 mbar, reducing the resulting product to magnetite by means of hydrogen and/or CO and/or an organic compound which can decompose in the presence of iron oxide, and then oxidizing the magnetite with an oxygen-containing gas to give acicular ferrimagnetic iron oxide of the formula FeO.sub.X, where X is from 1.33 to 1.50.

REFERENCES:
patent: 2900236 (1959-08-01), Speed et al.
patent: 3399142 (1968-08-01), Conley
patent: 3904540 (1975-09-01), Bennetch
patent: 4096292 (1978-06-01), Fagherazzi et al.
patent: 4209412 (1980-06-01), Marcot

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